[Python知识库]window操作Python27

1. 安装Python27

1.1 下载 python27 安装包

• 地址：https://www.python.org/downloads/
• 选择合适版本下载。
• python2.7.14：https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi

1.2 安装

• 双击安装包，进入安装页面，之后一直傻瓜式安装。

1.3 配置环境变量

• PATH 添加 Python 的安装路径

1.4 验证

• 打开 cmd 命令提示符，输入Python2，可以正确进入 Python 命令行操作界面，表示安装成功。

2. pip 安装模块错误

C:\Python27\Scripts>pip install numpy==1.9.3
Collecting numpy==1.9.3
  Cache entry deserialization failed, entry ignored
Exception:
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "c:\python27\lib\site-packages\pip\commands\install.py", line 324, in run
    requirement_set.prepare_files(finder)
  File "c:\python27\lib\site-packages\pip\req\req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "c:\python27\lib\site-packages\pip\req\req_set.py", line 620, in _prepare_file
    session=self.session, hashes=hashes)
  File "c:\python27\lib\site-packages\pip\download.py", line 821, in unpack_url
    hashes=hashes
  File "c:\python27\lib\site-packages\pip\download.py", line 659, in unpack_http_url
    hashes)
  File "c:\python27\lib\site-packages\pip\download.py", line 880, in _download_http_url
    file_path = os.path.join(temp_dir, filename)
  File "c:\python27\lib\ntpath.py", line 85, in join
    result_path = result_path + p_path
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 7: ordinal not in range(128)
You are using pip version 9.0.1, however version 22.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

• 错误原因：执行 c:\python27\lib\ntpath.py 文件时，result_path = result_path + p_path 语句，进行地址拼接是有中文字符。
• 解决方法：

# 打开c:\python27\lib\ntpath.py，添加下面语句。
import sys
reload(sys)
sys.setdefaultencoding("GBK")